Spark-plug.



A. V. PELLET.

SPARK PLUG.

v PPLIATIN FILED SEPT. 14,1907. 914,451 Patented Mar. 9, 1909.

" Il J6' NVENTOH ugas mile A TTHNEYS YM j Y To all whom it may concern:

l free them of collecte msi-Han STATES rTENT OFFICE.

AUGUST VTPELLET, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF, W. F. AUSTIN,AND C. E. LIPS- COMB, OF NEW YORK, N.y Y., A COPARTNERSHIP.

SPARK-PLUG.

Specification of Letters Patent. Application mea september 14, 1907.serial No. 392,927.

Patented March 9, 1909.

Be it known that I, AUGUST V. PELLET, a citizen of the United States,and a resident of the city of New York, borou hof Manhattan, in thecounty and State of ew York, have invented new and useful Improvementsin Spark-Plugs, of which the following is a full, c ear, and exactdescription.

This invention is an improved spark plug for internal combustionengines, the object of which is to'provide means whereb the ex losion ofthe charge within the cy inder wi operate to clean the sparkingterminals of the plug, thus making 1t unnecessary to -remove the plugfrom thev cylinder for this purpose. This object I attain by providingthe bore of the plug vwith openings which may be placed in communicationwith the outer atmosphere and thereby ermit a portion of the explodingchar e to blow through the plug past the s arklng terminals and soot,etc.

Reference -is to be had to the accompanying drawings forming. a part ofthis specification, in Whlch similar characters of reference indicatecorrespondin parts in all the views.

Fi 1re 1 is a side e evation of a plug emn bodylng my invention; Fig. 2is a vertical central section of the same on the line 2 2 of Fig. 1;Fig. 3 is a cross-section of the plug on the line 3-3 of Fig. 2; andFig. 4 is an inverted plan of the plug.

The preferred construction of m proved plu described in detail, conslstsof the exterior y-threaded lug 5, having a bore 6, which is counterboredat its upper end to receive and provide a seat for the usual orcelaininsulating stem 7, the said stem ein tightly forced to its seat by thepacking glan 8, threaded within the upperend of the plug 5 andsurrounding and snugly fitting the stem. The bottom or base of the plugis provided with a plurality of cross-slots 9, passing into the bore 6and dividing the ottom into a series of sectors 10. The

- `porcelain stem 7 carries the usual conductor 11, which is provided atits upper end with the customary binding-post, and the lower end orsparking terminal 12 passes within the intersection` of the cross-slots9, `Whereb the s ark Willjump between this termina and t e oints of thesectors 10.

The head of the plug 5 is exteriorly in the form of -a cone 13, throughwhich a series of4 upwardly and outwardly-directed apertures y of theinvention as 14 pxass, leading from the bore 6. A collar 15, aving aconical bore, snugly fits the cone 13 and is constructedlwith a seriesof openings 16,v passing substantially vertically therethrough, whichare equal in number. and adapted to be brought into register with the aertures 14, thus providing communication etween the bore of the plug andthe outer atmosphere. For forcing the collar 15 to its seat,- a nu-t 17yfits within an annular recess formed in the same, and is threaded uponthe plug 5. The nut 17 as best shown in `ig. 3 has a series ofcircumferential projections or keys 18, designed to engagewithcorresponding notches formed in the collar 15 intermediate y theopenings 16, thus securely connecting the nut and the collar together,and adapting the collar to be shifted on the nut when the latter isloosened, in order that the collar may be firmly ressed to its seat whenthe nut is tightene This construction permits of the collar being tumed.to

bring the openings 16 into register with the y -17 is tightened to carrythe openings in the collar out of alinement with the apertures, therebyforming a gas-tight joint on the conical faces of the cone 13 and collar15.

The invention as shown and described, while being the preferredpractical embodiment of my improved spark plug, may obv'iously bemodified in numerous minor particulars without de 'arting from thenature efinedin the claims annexed. l

Having thus described my invention, l claim as new ,and desire to secureby Letters Patent: v

1. A spark plug having an interior bore with a passage leading therefromto the atmosphere, a valve controlling said passage and providing in itsopen position a communication between the interior bore and the atmoshere through said valve.

2. A) spark plug provided with a head and an interior bore and a passa eleading from the bore through said hear?, and a collar seated on saidhead and provided with an o ening arranged to be brought into and outol) re ister withsaid passage.l

3. n a spark plug, a plug having a bore and provided with a conical headWith apertures leading from the bore of the plug through said head, anda collar litting th'e conical head and provided with'v openings adaptedto register With said apertures, whereby communication through thethe'purpose described.

4. In a spark plug, a plug having a bore,l

and provided Wlth a conicaljhead with an aperture leading from the borethrough said head, a collar seated upon and closely fitting the conicalvhead of the plug, having an opening adapted to be brought into'andycarried out of register With'said aperture, and a nut keyed to saidcollar and threadedon the plug for forcing the collar` to its seat.

lug with the outer atmosphere is providedp'forv 5. In a spark andprovided wi an aperture leading from the bore through the plug, a collarsurrounding' the plug, having an openin'g adapted to be'turned into andout of register with said aperture, a nut threaded on the plug, and

W. W. Horfr, JOHN P. Davis.l

plug, a plug having a bore, l t

